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Simulation of Water-Use Efficiency of Crops under Different Irrigation Strategies
Water ( IF 3.0 ) Pub Date : 2020-10-20 , DOI: 10.3390/w12102930
Mathias Kuschel-Otárola , Diego Rivera , Eduardo Holzapfel , Niels Schütze , Patricio Neumann , Alex Godoy-Faúndez

Irrigation management is a key factor in attaining optimal yields, as different irrigation strategies lead to different yields even when using the same amount of water or under the same weather conditions. Our research aimed to simulate the water-use efficiency (WUE) of crops considering different irrigation strategies in the Central Valley of Chile. By means of AquaCrop-OS, we simulated expected yields for combinations of crops (maize, sugar beet, wheat), soil (clay loam, loam, silty clay loam, and silty loam), and bulk density. Thus, we tested four watering strategies: rainfed, soil moisture-based irrigation, irrigation with a fixed interval every 1, 3, 5, and 7 days, and an algorithm for optimal irrigation scheduling under water supply constraints (GET-OPTIS). The results showed that an efficient irrigation strategy must account for soil and crop characteristics. Among the tested strategies, GET-OPTIS led to the best performance for crop yield, water use, water-use efficiency, and profit, followed by the soil moisture-based strategy. Thus, soil type has an important influence on the yield and performance of different irrigation strategies, as it provides a significant storage and buffer for plants, making it possible to produce “more crop per drop”. This work can serve as a methodological guide for simulating the water-use efficiency of crops and can be used alongside evidence from the field.

中文翻译:

不同灌溉策略下作物水分利用效率模拟

灌溉管理是获得最佳产量的关键因素,因为即使使用相同量的水或在相同的天气条件下,不同的灌溉策略也会导致不同的产量。我们的研究旨在模拟智利中央山谷考虑不同灌溉策略的作物的用水效率 (WUE)。通过 AquaCrop-OS,我们模拟了作物(玉米、甜菜、小麦)、土壤(粘壤土、壤土、粉质粘壤土和粉质壤土)和容重组合的预期产量。因此,我们测试了四种浇水策略:雨育、基于土壤水分的灌溉、每 1、3、5 和 7 天固定间隔的灌溉,以及在供水限制条件下优化灌溉调度的算法 (GET-OPTIS)。结果表明,有效的灌溉策略必须考虑土壤和作物特性。在经过测试的策略中,GET-OPTIS 在作物产量、用水量、用水效率和利润方面表现最佳,其次是基于土壤水分的策略。因此,土壤类型对不同灌溉策略的产量和性能有重要影响,因为它为植物提供了重要的储存和缓冲,使其有可能“每滴更多的作物”。这项工作可以作为模拟作物用水效率的方法指南,并且可以与来自现场的证据一起使用。土壤类型对不同灌溉策略的产量和性能有重要影响,因为它为植物提供了重要的储存和缓冲,使其能够“每滴更多的作物”。这项工作可以作为模拟作物用水效率的方法指南,并且可以与来自现场的证据一起使用。土壤类型对不同灌溉策略的产量和性能有重要影响,因为它为植物提供了重要的储存和缓冲,使其有可能“每滴更多的作物”。这项工作可以作为模拟作物用水效率的方法指南,并且可以与来自现场的证据一起使用。
更新日期:2020-10-20
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